The Lower Maumee Watershed (HUC 04100009) covers an area of approximately 4,155 square miles in northwestern Ohio. The watershed is drained by the Maumee River, which flows into Lake Erie. The hydrology of the area is influenced by the Great Lakes and the region's climate, which is characterized by cold winters and warm summers. The watershed receives an average annual precipitation of about 33 inches, with most of the precipitation occurring during the summer months. The area experiences occasional snowstorms during the winter months, with an average snowfall of about 37 inches per year. The surface water quality is impacted by agricultural runoff, urbanization, and industrial activities. The watershed also contains several reservoirs, including the Grand Lake St. Marys and the Indian Lake. The reservoirs are used for water supply, recreation, and flood control. In recent years, the watershed has experienced heavy rainfall events and flooding due to changing climate patterns.